i almost have realtime information where shots are being fired and where i'm going. >> here's how it works. when a gun is fired, the sound is picked up and recorded by multiple season cores placed in different locations. each sensor records the exact time it detected the shot. shots spotter uses those times and the distance between each sensor to determine the location of the gunfire. >> gunfire calves a very great distance. one or two miles. if you have sensors far apart then only the strongest sound that the gunfire will give to several sensors. >> tells me what happens. walk me through it. >> the first task is to look at where that shot took place. and what kind of other information he or she they can responpass long to the respondig officer. >> close by its hard to tell what is going on. but further and further away halfway through this there is some other noise that is a second person shooting. it's exact i the sort of thing you cannot find on 911. >> wow, and techno's lindsay moran joins us from the land of pleasant living. baltimore and maryland, good to see you again. you sho